The caliber has intrigued me since I first heard about it. Finally shot one one day at a range. Snappy recoil, as mentioned, but not bad. I, too, LIKE the idea of 357 Mag ballistics in a semiauto. I would have one already except for the fact that the pistol that I had picked out came in 357 Sig, but NOT in the 'compact' size in that caliber, and that is what I wanted. No one makes a 'conversion' barrel for my 40, which is a Beretta Px4, (what I finally decided on), or I'd have one.
There are, reportedly, several DISadvantages to it: first, the penetration is so extreme that it can be a problem in a SD situation. Innocent bystanders.....
Second, it is a 'bottleneck' cartridge, so although you would probably have to reload for it, due to its hard-to-find and costly attributes, it would be a substantially harder cartridge to reload. Not impossible, I'm sure, but certainly not like a straight-walled pistol case. I've read of some difficulties in this regard, but have no 'first-hand' knowledge or info on it.